Cause:
Smart-UPS products 2 kVA and above offer a variety of back plate options to allow you to customize the output plugs to your needs.

Resolution:
Installing an optional back plate is an easy way to change the output connectors available on your Smart-UPS. Please review the following document for the procedure to modify the output PDU / backplate / outlets panels on a Smart-UPS model above 2 kVA.